Thermal management solutions for stacked integrated circuit devices

ABSTRACT

An integrated circuit assembly may be formed having a substrate, a first integrated circuit device electrically attached to the substrate, a second integrated circuit device electrically attached to the first integrated circuit device, and a heat dissipation device defining a fluid chamber, wherein at least a portion of the first integrated circuit device and at least a portion of the second integrated circuit device are exposed to the fluid chamber. In further embodiments, at least one channel may be formed in an underfill material between the first integrated circuit device and the second integrated circuit device, between the first integrated circuit device and the substrate, and/or between the second integrated circuit device and the substrate, wherein the at least one channel is open to the fluid chamber.

TECHNICAL FIELD

Embodiments of the present description generally relate to the removalof heat from integrated circuit devices, and, more particularly, tothermal management solutions wherein a heat transfer fluid of a heatdissipation device is in physical contact with stacked integratedcircuit devices within an integrated circuit device package.

BACKGROUND

Higher performance, lower cost, increased miniaturization, and greaterpackaging density of integrated circuits within integrated circuitdevices are ongoing goals of the electronics industry. As these goalsare achieved, the integrated circuit devices become smaller.Accordingly, the density of power consumption of electronic componentswithin the integrated circuit devices has increased, which, in turn,increases the average junction temperature of the integrated circuitdevice. If the temperature of the integrated circuit device becomes toohigh, the integrated circuits may be damaged or destroyed. This issuebecomes even more critical when multiple integrated circuit devices areincorporated in a stacked configuration. As will be understood to thoseskilled in the art, when multiple integrated circuit devices arestacked, some of the integrated circuit devices will be “internally”positioned between an adjacent integrated circuit device and a substrateto which the stacked integrated circuit devices are attached or will bepositioned between a pair of adjacent integrated circuit devices. Assuch, these internally positioned integrated circuit devices areisolated from thermal management solutions, such as heat spreaders,since the integrated circuit devices and/or the substrate to which theintegrated circuit devices may be adjacent, are generally not efficientthermal conductors, nor are the various intervening layers, such asthermal interface material layers, underfill materials, and the like,which are between the internally positioned integrated circuit deviceand the thermal management solutions. This problem is exacerbated bythermal cross talk between the stacked integrated circuit devices andpotential superposition of the hot spots due to the stacking, as will beunderstood to those skilled in the art. Thus, the internally positionedintegrated circuit devices may exceed their temperature limits, whichmay require throttling (speed reduction of the integrated circuitdevices) that can lead to reduced performance, or, in extreme cases, canlead to damage and failure of the entire integrated circuit package.

BRIEF DESCRIPTION OF THE DRAWINGS

The subject matter of the present disclosure is particularly pointed outand distinctly claimed in the concluding portion of the specification.The foregoing and other features of the present disclosure will becomemore fully apparent from the following description and appended claims,taken in conjunction with the accompanying drawings. It is understoodthat the accompanying drawings depict only several embodiments inaccordance with the present disclosure and are, therefore, not to beconsidered limiting of its scope. The disclosure will be described withadditional specificity and detail through use of the accompanyingdrawings, such that the advantages of the present disclosure can be morereadily ascertained, in which:

FIG. 1 is a side cross-sectional view of an integrated circuit stackedstructure, according to an embodiment of the present description.

FIG. 2 is a side cross-sectional view of an electronic assembly havingstacked integrated circuit devices, according to an embodiment of thepresent description.

FIGS. 3-8 are top plan views of exemplary arrangements of a plurality ofintegrated circuit devices in various electronic assemblies, accordingto various embodiments of the present description.

FIG. 9 is a side cross-sectional view of an electronic assembly havingstacked integrated circuit devices, according to another embodiment ofthe present description.

FIG. 10 is a side cross-sectional view of an electronic assembly havingstacked integrated circuit devices coupled to a direct fluid contactheat dissipation device, according to one embodiment of the presentdescription.

FIG. 11 is a cross-sectional view of the direct fluid contact heatdissipation device along line 11-11 of FIG. 10, according to anembodiment of the present description.

FIG. 12 is a side cross-sectional view of a direct fluid contact heatdissipation device having manifolded inlet and outlet ports, accordingto one embodiment of the present description.

FIG. 13 is a side cross-sectional view of an integrated circuitstructure having stacked integrated circuit devices coupled to a directfluid contact heat dissipation device having a separately fabricatedboundary wall, according to another embodiment of the presentdescription.

FIG. 14 is a side cross-sectional view of an integrated circuitstructure having stacked integrated circuit devices coupled to a directfluid contact heat dissipation device wherein the underfill material ofeach of the stacked integrated circuits devices includes channels tofacilitate heat removal from a first surface of each of the stackedintegrated circuit devices, according to one embodiment of the presentdescription.

FIG. 15 is a side cross-sectional view of an integrated circuit deviceattached to a substrate, wherein the underfill material therebetweenincludes channels to facilitate heat removal from a first surface of theintegrated circuit device, according to an embodiment of the presentdescription.

FIG. 16 is a side cross-sectional view of a first integrated circuitdevice attached to a second integrated circuit device, wherein theunderfill material therebetween includes channels to facilitate heatremoval from a first surface of the first integrated circuit device anda second surface of the second integrated circuit device, according toan embodiment of the present description.

FIG. 17 is a top cross-sectional view along line 17-17 of FIG. 16,according to an embodiment of the present description.

FIG. 18 is a top cross-sectional view of a channel configuration,according to another embodiment of the present description.

FIG. 19 is a side cross-sectional view of an integrated circuit deviceattached to a substrate wherein channels are formed to facilitate heatremoval from a first surface of the integrated circuit device andwherein the interconnects between the integrated circuit are positionedin groupings and the groupings are surrounded by a sealing structure,according to an embodiment of the present description.

FIG. 20 is a side cross-sectional view of a first integrated circuitdevice attached to a second integrated circuit device (along line 20-20of FIG. 21), wherein channels are formed to facilitate heat removal froma first surface of the first integrated circuit device and a secondsurface of the second integrated circuit device, according to anembodiment of the present description.

FIGS. 21-24 are top cross-sectional views of various channelconfigurations having interconnects in groupings, according to anotherembodiment of the present description.

FIG. 25 is a schematic of an electronic device/system, according to anembodiment of the present description.

DESCRIPTION OF EMBODIMENTS

In the following detailed description, reference is made to theaccompanying drawings that show, by way of illustration, specificembodiments in which the claimed subject matter may be practiced. Theseembodiments are described in sufficient detail to enable those skilledin the art to practice the subject matter. It is to be understood thatthe various embodiments, although different, are not necessarilymutually exclusive. For example, a particular feature, structure, orcharacteristic described herein, in connection with one embodiment, maybe implemented within other embodiments without departing from thespirit and scope of the claimed subject matter. References within thisspecification to “one embodiment” or “an embodiment” mean that aparticular feature, structure, or characteristic described in connectionwith the embodiment is included in at least one implementationencompassed within the present invention. Therefore, the use of thephrase “one embodiment” or “in an embodiment” does not necessarily referto the same embodiment. In addition, it is to be understood that thelocation or arrangement of individual elements within each disclosedembodiment may be modified without departing from the spirit and scopeof the claimed subject matter. The following detailed description is,therefore, not to be taken in a limiting sense, and the scope of thesubject matter is defined only by the appended claims, appropriatelyinterpreted, along with the full range of equivalents to which theappended claims are entitled. In the drawings, like numerals refer tothe same or similar elements or functionality throughout the severalviews, and that elements depicted therein are not necessarily to scalewith one another, rather individual elements may be enlarged or reducedin order to more easily comprehend the elements in the context of thepresent description.

The terms “over”, “to”, “between” and “on” as used herein may refer to arelative position of one layer with respect to other layers. One layer“over” or “on” another layer or bonded “to” another layer may bedirectly in contact with the other layer or may have one or moreintervening layers. One layer “between” layers may be directly incontact with the layers or may have one or more intervening layers.

The term “package” generally refers to a self-contained carrier of oneor more dice, where the dice are attached to the package substrate, andmay be encapsulated for protection, with integrated or wire-bonedinterconnects between the dice and leads, pins or bumps located on theexternal portions of the package substrate. The package may contain asingle die, or multiple dice, providing a specific function. The packageis usually mounted on a printed circuit board for interconnection withother packaged integrated circuits and discrete components, forming alarger circuit.

Here, the term “cored” generally refers to a substrate of an integratedcircuit package built upon a board, card or wafer comprising anon-flexible stiff material. Typically, a small printed circuit board isused as a core, upon which integrated circuit device and discretepassive components may be soldered. Typically, the core has viasextending from one side to the other, allowing circuitry on one side ofthe core to be coupled directly to circuitry on the opposite side of thecore. The core may also serve as a platform for building up layers ofconductors and dielectric materials.

Here, the term “coreless” generally refers to a substrate of anintegrated circuit package having no core. The lack of a core allows forhigher-density package architectures. as the through-vias haverelatively large dimensions and pitch compared to high-densityinterconnects.

Here, the term “land side”, if used herein, generally refers to the sideof the substrate of the integrated circuit package closest to the planeof attachment to a printed circuit board, motherboard, or other package.This is in contrast to the term “die side”, which is the side of thesubstrate of the integrated circuit package to which the die or dice areattached.

Here, the term “dielectric” generally refers to any number ofnon-electrically conductive materials that make up the structure of apackage substrate. For purposes of this disclosure, dielectric materialmay be incorporated into an integrated circuit package as layers oflaminate film or as a resin molded over integrated circuit dice mountedon the substrate.

Here, the term “metallization” generally refers to metal layers formedover the dielectric material of the package substrate. The metal layersare generally patterned to form metal structures such as traces and bondpads. The metallization of a package substrate may be confined to asingle layer or in multiple layers separated by layers of dielectric.

Here, the term “bond pad” generally refers to metallization structuresthat terminate integrated traces and vias in integrated circuit packagesand dies. The term “solder pad” may be occasionally substituted for“bond pad” and carries the same meaning.

Here, the term “solder bump” generally refers to a solder layer formedon a bond pad. The solder layer typically has a round shape, hence theterm “solder bump”.

Here, the term “substrate” generally refers to a planar platformcomprising dielectric and metallization structures. The substratemechanically supports and electrically couples one or more IC dies on asingle platform, with encapsulation of the one or more integratedcircuit devices by a moldable dielectric material. The substrategenerally comprises solder bumps as bonding interconnects on both sides.One side of the substrate, generally referred to as the “die side”,comprises solder bumps for chip or die bonding. The opposite side of thesubstrate, generally referred to as the “land side”, comprises solderbumps for bonding the package to a printed circuit board.

Here, the term “assembly” generally refers to a grouping of parts into asingle functional unit. The parts may be separate and are mechanicallyassembled into a functional unit, where the parts may be removable. Inanother instance, the parts may be permanently bonded together. In someinstances, the parts are integrated together.

Throughout the specification, and in the claims, the term “connected”means a direct connection, such as electrical, mechanical, or magneticconnection between the things that are connected, without anyintermediary devices.

The term “coupled” means a direct or indirect connection, such as adirect electrical, mechanical, magnetic or fluidic connection betweenthe things that are connected or an indirect connection, through one ormore passive or active intermediary devices.

The term “circuit” or “module” may refer to one or more passive and/oractive components that are arranged to cooperate with one another toprovide a desired function. The term “signal” may refer to at least onecurrent signal, voltage signal, magnetic signal, or data/clock signal.The meaning of “a,” “an,” and “the” include plural references. Themeaning of “in” includes “in” and “on.”

The vertical orientation is in the z-direction and it is understood thatrecitations of “top”, “bottom”, “above” and “below” refer to relativepositions in the z-dimension with the usual meaning. However, it isunderstood that embodiments are not necessarily limited to theorientations or configurations illustrated in the figure.

The terms “substantially,” “close,” “approximately,” “near,” and“about,” generally refer to being within +/−10% of a target value(unless specifically specified). Unless otherwise specified the use ofthe ordinal adjectives “first,” “second,” and “third,” etc., to describea common object, merely indicate that different instances of likeobjects to which are being referred and are not intended to imply thatthe objects so described must be in a given sequence, either temporally,spatially, in ranking or in any other manner.

For the purposes of the present disclosure, phrases “A and/or B” and “Aor B” mean (A), (B), or (A and B). For the purposes of the presentdisclosure, the phrase “A, B, and/or C” means (A), (B), (C), (A and B),(A and C), (B and C), or (A, B and C).

Views labeled “cross-sectional”, “profile” and “plan” correspond toorthogonal planes within a cartesian coordinate system. Thus,cross-sectional and profile views are taken in the x-z plane, and planviews are taken in the x-y plane. Typically, profile views in the x-zplane are cross-sectional views. Where appropriate, drawings are labeledwith axes to indicate the orientation of the figure.

Embodiments of the present description include an integrated circuitassembly having a substrate, a first integrated circuit deviceelectrically attached to the substrate, a second integrated circuitdevice electrically attached to the first integrated circuit device, anda heat dissipation device defining a fluid chamber, wherein at least aportion of the first integrated circuit device and at least a portion ofthe second integrated circuit device are exposed to the fluid chamber,such that when a heat transfer fluid is introduced into the fluidchamber, the heat transfer fluid makes direct contact with the firstintegrated circuit device and the second integrated circuit device. Infurther embodiments, at least one channel may be formed in an underfillmaterial between the first integrated circuit device and the secondintegrated circuit device, between the first integrated circuit deviceand the substrate, and/or between the second integrated circuit deviceand the substrate, wherein the at least one channel is open to the fluidchamber.

In the production of integrated circuit packages, integrated circuitdevices are generally mounted on substrates, which provide electricalcommunication routes between the integrated circuit devices and/or withexternal components. As shown in FIG. 1, an integrated circuit stackedstructure 100 may comprise a plurality of integrated circuit devices(illustrated as first integrated circuit device 110 ₁, and secondintegrated circuit device 110 ₂), such as microprocessors, chipsets,graphics devices, wireless devices, memory devices, application specificintegrated circuits, combinations thereof, stacks thereof, or the like,attached to a substrate 120, such as an interposer, a printed circuitboard, a motherboard, and the like. As illustrated, the substrate 120may include a recess 124 formed to extend into the substrate 120 from afirst surface 122 (also known as the “die side”) thereof and the firstintegrated circuit device 110 ₁ may be at least partially disposed inthe recess 124. The first integrated circuit device 110 ₁ may beelectrically attached to the substrate 120 within the recess 124 througha first plurality of device-to-substrate interconnects 132 ₁, such asreflowable solder bumps or balls, in a configuration generally known asa flip-chip or controlled collapse chip connection (“C4”) configuration.The first plurality of device-to-substrate interconnects 132 ₁ mayextend from bond pads 134 ₁ on a first surface 112 ₁ of the firstintegrated circuit device 110 ₁ and bond pads 136 ₁ on a bottom surface126 of the recess 124 of the substrate 120. The integrated circuitdevice bond pads 134 ₁ of first integrated circuit device 110 ₁ may bein electrical communication with circuitry (not shown) within the firstintegrated circuit device 110 ₁, such as with through-silicon vias 116.

As further shown in FIG. 1, the second integrated circuit device 110 ₂may be attached to a first surface 122 of the substrate 120 through asecond plurality of device-to-substrate interconnects 132 ₂, such asreflowable solder bumps or balls. The second plurality ofdevice-to-substrate interconnects 132 ₂ may extend from bond pads 134 ₂on a first surface 112 ₂ of the second integrated circuit device 110 ₂and bond pads 136 ₂ on the first surface 122 of the substrate 120. Asolder resist material 148 may also be patterned on the first surface122 of the substrate 120 to assist in the containment and attachment ofthe second plurality of device-to-substrate interconnects 132 ₂. Thebond pads 134 ₂ of the second integrated circuit device 110 ₂ may be inelectrical communication with circuitry (not shown) within the secondintegrated circuit device 110 ₂. The substrate 120 may include at leastone conductive route 140 extending therethrough or thereon to formelectrical connections between the first integrated circuit device 110 ₁and the second integrated circuit device 110 ₂ and/or from theintegrated circuit devices 110 ₁, 110 ₂ to external components (notshown).

The first integrated circuit device 110 ₁ and the second integratedcircuit device 110 ₂ may be electrically attached to one another througha first plurality of high-density device-to-device interconnects 152 ₁.As used herein, the term “high density” is relative to thedevice-to-substrate interconnects 132 ₁ and 132 ₂, which have a greaterpitch than the first plurality of high-density device-to-deviceinterconnects 152 ₁. In some embodiments, the first plurality of highdensity device-to-device interconnects 152 ₁ may be fabricated using amodified semi-additive process or a semi-additive build-up process withadvanced lithography (with small vertical interconnect features formedby advanced laser or lithography processes), as will be understood tothose skilled in the art, while the device-to-substrate interconnects132 ₁ and 132 ₂ may be fabricated using a lower density process, such asa standard subtractive process using etch chemistry to remove areas ofunwanted conductive material and forming coarse vertical interconnectfeatures by a standard laser process. The first plurality ofhigh-density device-to-device interconnects 152 ₁ may comprisehigh-density bond pads 154 on the first surface 112 ₂ of the secondintegrated circuit device 110 ₂ and high-density bond pads 156 on asecond surface 114 ₁ of the first integrated circuit device 110 ₁ withsolder balls 158 extending therebetween.

The substrate 120 may be primarily composed of an appropriate dielectricmaterial, including, but not limited to, bismaleimide triazine (BT)resin, fire retardant grade 4 (FR-4) material, polyimide materials,glass reinforced epoxy matrix material, low-k and ultra low-kdielectrics (e.g. carbon-doped dielectrics, fluorine-doped dielectrics,porous dielectrics, and organic polymeric dielectric), and the like, aswell as laminates or multiple layers thereof. The substrate conductiveroutes 140, also known as metallization, may be composed of anyconductive material, including but not limited to metals, such ascopper, silver, gold, nickel, and aluminum, and alloys thereof. As willbe understood to those skilled in the art, the substrate conductiveroutes 140 may be formed as a plurality of conductive traces 142 ₁, 142₂, and 142 ₃ formed on layers of dielectric material 146 ₁, 146 ₂, 146₃, 146 ₄, which are electrically connected by conductive vias 144 ₁, 144₂, 144 ₃, 144 ₄. Furthermore, the substrate 120 may be either a cored ora coreless substrate.

In an embodiment of the present description, one or more of theconductive routes 140 in the substrate 120 may extend between the bondpads 136 ₂ at the first surface 122 of the substrate 120 and externalconnection bond pads 138 at a second surface 128 of the substrate 120.In an embodiment of the present description, one or more of theconductive routes 140 in the substrate 120 may extend between bond pads136 ₁ at the bottom surface 126 of the recess 124 and externalconnection bond pads 138 at the second surface 128 of the substrate 120.In some embodiments, one or more of the conductive routes 140 in thesubstrate 120 may extend between bond pads 136 ₂ at the first surface122 of the substrate 120 and bond pads 136 ₁ at the bottom surface 126of the recess 124.

The device-to-substrate interconnects 132 ₁, 132 ₂ and the firstplurality of high-density device-to-device interconnects 152 ₁ can bemade of any appropriate material, including, but not limited to, soldersmaterials. The solder materials may be any appropriate material,including, but not limited to, lead/tin alloys, such as 63% tin/37% leadsolder, and high tin content alloys (e.g. 90% or more tin), such astin/bismuth, eutectic tin/silver, ternary tin/silver/copper, eutectictin/copper, and similar alloys. When the first integrated circuit device110 ₁ is attached to the substrate 120 with device-to-substrateinterconnects 132 ₁ made of solder, when the second integrated circuitdevice 110 ₂ is attached to the substrate 120 with device-to-substrateinterconnects 132 ₂ made of solder, and/or when the second integratedcircuit device 110 ₂ is attached to the first integrated circuit device110 ₁ with the first plurality of high density device-to-deviceinterconnects 152 ₁ made of solder, the solder is reflowed, either byheat, pressure, and/or sonic energy to secure the solder therebetween.

FIG. 2 illustrates an electronic assembly having stacked integratedcircuit devices. As shown in FIG. 2, the structure of FIG. 1 may beformed within an electronic assembly 160. The electronic assembly 160may further include additional integrated circuit devices, i.e. a thirdintegrated circuit device 110 ₃ and a fourth integrated circuit device110 ₄. In one embodiment, as discussed with regard to the secondintegrated circuit device 110 ₂, the third integrated circuit device 110₃ may be attached to the first surface 122 of the substrate 120 througha third plurality of device-to-substrate interconnects 132 ₃, such asreflowable solder bumps or balls. The third plurality ofdevice-to-substrate interconnects 132 ₃ may extend from bond pads (notshown) on a first surface 112 ₃ of the third integrated circuit device110 ₃ and bond pads (not shown) on the first surface 122 of thesubstrate 120. The bond pads (not shown) of the third integrated circuitdevice 110 ₃ may be in electrical communication with circuitry (notshown) within the third integrated circuit device 110 ₃. The firstintegrated circuit device 110 ₁ and the third integrated circuit device110 ₃ may be electrically attached to one another through a secondplurality of high-density interconnects 152 ₂, in the manner previouslydiscussed. In a further embodiment of the present description, a firstsurface 112 ₄ of the fourth integrated circuit device 110 ₄ may beattached to the second surface 114 ₁ of the first integrated circuitdevice 110 ₁ through a third plurality of high-density interconnects 152₃.

It is further understood that a first underfill material 172, such as anepoxy material, may be disposed between the first surface 112 ₁ of thefirst integrated circuit device 110 ₁ and the bottom surface 126 of therecess 124 of the substrate 120 and surround the first plurality ofdevice-to-substrate interconnects 132 ₁. The first underfill material172 is further disposed between the first surface 112 ₂ of the secondintegrated circuit device 110 ₂ and the first surface 122 of thesubstrate 120 to surround the second plurality of device-to-substrateinterconnects 132 ₂ and disposed between the first surface 112 ₂ of thesecond integrated circuit 110 ₂ and at least a portion of the secondsurface 114 ₁ of first integrated circuit device 110 ₁ to surround thefirst plurality of high-density interconnects 152 ₁. The first underfillmaterial 172 is still further disposed between the first surface 112 ₃of the third integrated circuit device 110 ₃ and the first surface 122of the substrate 120 to surround the second plurality ofdevice-to-substrate interconnects 132 ₃ and disposed between the firstsurface 112 ₃ of the third integrated circuit 110 ₃ and at least aportion of the second surface 114 ₁ of the first integrated circuitdevice 110 ₁ to surround the second plurality of high-densityinterconnects 152 ₂. A second underfill material 174, such as an epoxymaterial, may be disposed between the second surface 114 ₁ of the firstintegrated circuit device 110 ₁ and the first surface 112 ₄ of thefourth integrated circuit device 110 ₄ to surround the third pluralityof high-density interconnects 152 ₃. The first underfill material 172and the second underfill material 174 may provide structural integrityand may prevent contamination, as will be understood to those skilled inthe art.

It is understood that the electronic assembly 160 of FIG. 2 may have anyappropriate number of integrated circuit devices (e.g. elements 110₁-110 ₄) in any appropriate arrangement. For example, FIGS. 3-8 are topviews of exemplary arrangements of a plurality of integrated circuitdevices in various electronic assemblies 160, in accordance withembodiments of the present description, and which may be referred to asomni-directional interconnect (ODI) integration schemes. For the purposeof clarity, the substrate 120 has not been illustrated in FIGS. 3-8.However, it is understood that in some embodiment at least one of theplurality of integrated circuit devices 110A, 110B, 110C may be at leastpartially disposed in one or more recesses 124 in the substrate 120(such as shown in FIG. 2). In other embodiments, none of the pluralityof integrated circuit devices 110A, 110B, 110C may be disposed in one ormore recesses 124 in the substrate 120 (such as shown in FIG. 2). In thearrangements shown in FIGS. 3-8, the integrated circuit devices 110A,110B, 110C may include any suitable circuitry. For example, in someembodiments, the integrated circuit device 110A may be an active orpassive die, and the integrated circuit devices 110B may includeinput/output circuitry, high bandwidth memory, and/or enhanced dynamicrandom-access memory (EDRAM).

As shown in FIG. 3, at least one integrated circuit device 110A may bepositioned below a plurality of integrated circuit devices (illustratedas edge integrated circuit devices 110B and central integrated circuitdevice 110C). The integrated circuit device 110A may act as a bridgingdevice and may be connected to the substrate 120 (not shown forclarity—see FIG. 2) in any manner previously disclosed herein withreference to the integrated circuit device 110 ₁. The integrated circuitdevices 110B may span the substrate 120 (see FIG. 2) and span at least aportion of the integrated circuit device 110A (e.g., in any mannerdisclosed herein with reference to the integrated circuit devices 110 ₂and 110 ₃ of FIG. 2). FIG. 3 also illustrates an integrated circuitdevice 110C disposed on the integrated circuit device 110A (e.g., in themanner disclosed herein with reference to the integrated circuit device110 ₃ of FIG. 2). In FIG. 3, the integrated circuit devices 110B may“overlap” the edges and/or the corners of the integrated circuit device110A, while the integrated circuit device 110C may be entirely above theintegrated circuit device 110A. Placing the integrated circuit devices110B at least partially over the corners of the integrated circuitdevice 110A may reduce routing congestion in the integrated circuitdevice 110A and may improve utilization of the integrated circuit device110A (e.g., in case the number of input/outputs needed between theintegrated circuit device 110A and the integrated circuit devices 110Bis not large enough to require the full edge of the integrated circuitdevice 110A).

FIG. 4 also illustrates an arrangement in which the integrated circuitdevice 110A is disposed below multiple different integrated circuitdevices 110B. The integrated circuit device 110A may be connected to thesubstrate 120 (not shown) in any manner disclosed herein with referenceto the integrated circuit device 110 ₁, while the integrated circuitdevices 110B may span the substrate 120 (not shown) and the integratedcircuit device 110A (e.g., in any manner disclosed herein with referenceto the integrated circuit devices 110 ₂ and 110 ₃). FIG. 4 alsoillustrates two integrated circuit devices 110C disposed on theintegrated circuit device 110A (e.g., in the manner disclosed hereinwith reference to the integrated circuit device 110 ₄). In FIG. 4, theintegrated circuit devices 110B “overlap” the edges of the integratedcircuit device 110A, while the integrated circuit devices 110C arewholly above the integrated circuit device 110A. In the embodiment ofFIG. 4, the integrated circuit devices 110B and 110C may be arranged ina portion of a rectangular array.

FIG. 5 illustrates an embodiment wherein two integrated circuit devices110A may take the place of the single integrated circuit device 110Aillustrated in FIG. 4, and one or more integrated circuit devices 110Cmay “bridge” the two integrated circuit devices 110A.

FIG. 6 illustrates an arrangement in which the integrated circuit device110A is disposed below multiple different integrated circuit devices110B. The integrated circuit device 110A may be connected to a substrate120 (not shown) in any manner disclosed herein with reference to theintegrated circuit device 110 ₁, while the integrated circuit devices110B may span the substrate 120 and the integrated circuit device 110A(e.g., in any manner disclosed herein with reference to the integratedcircuit device 110 ₂ and 110 ₃). In FIG. 6, the integrated circuitdevices 110B “overlap” the edges and/or the corners of the integratedcircuit device 110A. In the embodiment of FIG. 6, the integrated circuitdevices 110B may be arranged in a portion of a rectangular array.

FIG. 7 illustrates an arrangement in which multiple integrated circuitdevices 110A are disposed below multiple different integrated circuitdevices 110B such that each integrated circuit device 110A bridges twoor more horizontally or vertically adjacent integrated circuit devices110B. The integrated circuit devices 110A may be connected to asubstrate 120 (not shown) in any manner disclosed herein with referenceto the integrated circuit device 110 ₁ of FIG. 2, while the integratedcircuit devices 110B may span the substrate 120 (not shown) and theintegrated circuit device 110A (e.g., in any manner disclosed hereinwith reference to the integrated circuit device 110 ₂ of FIG. 2). InFIG. 7, the integrated circuit devices 110B “overlap” the edges of theadjacent integrated circuit devices 110A.

FIG. 8 illustrates an arrangement in which multiple integrated circuitdevices 110A are disposed below multiple different integrated circuitdevices 110B such that each integrated circuit device 110A bridges thefour diagonally adjacent integrated circuit devices 110B. The integratedcircuit devices 110A may be connected to the substrate 120 (not shown)in any manner disclosed herein with reference to the integrated circuitdevice 110 ₁ of FIG. 2, while the integrated circuit devices 110B mayspan the substrate 120 and the integrated circuit device 110A (e.g., inany manner disclosed herein with reference to the integrated circuitdevices 110 ₂ and 110 ₃ of FIG. 2). In FIG. 8, the integrated circuitdevices 110B “overlap” the corners of the adjacent integrated circuitdevices 110A.

Although some embodiments illustrated in the present description have atleast one integrated circuit device, such as integrated circuit device110 ₁ within recess 124 (see FIG. 2) in the substrate 120, theembodiment are not so limited. As shown in FIG. 9, the integratedcircuit devices 110 ₁-110 ₄ may be configurated, stacked, disposed in amold material 192 to form a molded package 195, and attached in a mannersuch that a recess is not necessary. As shown, the molded package 195may include the first integrated circuit device 110 ₁ attached to thefirst surface 122 of the substrate 120 through the first plurality ofdevice-to-substrate interconnects 132 ₁. The second integrated circuitdevice 110 ₂ may be attached to the first surface 122 of the substrate120 through the second plurality of device-to-substrate interconnects132 ₂ which are electrically attached to through-mold interconnects 196and device interconnects 194 within the molded package 190. The thirdintegrated circuit device 110 ₃ may be attached to the first surface 122of the substrate 120 through the third plurality of device-to-substrateinterconnects 132 ₃ which are also electrically attached to through-moldinterconnects 196 and device interconnects 194 within the molded package190. The processes for the fabrication of a molded package 195 are wellknown in the art and for purposes of brevity and conciseness will not bedescribed herein. However, it is noted the mold material 192 isfabricated such that at least a portion of the second surface of thefirst integrated circuit device 110 ₁ is exposed.

The first integrated circuit device 110 ₁ and the second integratedcircuit device 110 ₂ may be electrically attached to one another throughthe first plurality of high-density interconnects 152 ₁. Furthermore,the first integrated circuit device 110 ₁ and the third integratedcircuit device 110 ₃ may be electrically attached to one another throughthe second plurality of high-density interconnects 152 ₂. The firstsurface 112 ₄ of the fourth integrated circuit device 110 ₄ may beattached to the second surface 114 ₁ of the first integrated circuitdevice 110 ₁ through the third plurality of high-density interconnects152 ₃.

As previously discussed, the first underfill material 172 may bedisposed between the first surface 112 ₁ of the first integrated circuitdevice 110 ₁ and the first surface 122 of the substrate 120 and maysurround the first plurality of device-to-substrate interconnects 132 ₁.The first underfill material 172 is further disposed between the moldmaterial 192 and the first surface 122 of the substrate 120 to surroundthe second plurality of device-to-substrate interconnects 132 ₂ and tosurround the third plurality of device-to-substrate interconnects 132 ₃.The second underfill material 174 may be disposed between the firstsurface 112 ₂ of the second integrated circuit device 110 ₂ and thesecond surface 114 ₁ of first integrated circuit device 110 ₁ tosurround the first plurality of high-density interconnects 152 ₁. Thesecond underfill material 174 may further be disposed between the firstsurface 112 ₃ of the third integrated circuit device 110 ₃ and thesecond surface 114 ₁ of the first integrated circuit device 110 ₁ tosurround the second plurality of high-density interconnects 152 ₂. Thesecond underfill material 174 may still further be disposed between thesecond surface 114 ₁ of the first integrated circuit device 110 ₁ andthe first surface 112 ₄ of the fourth integrated circuit device 110 ₄ tosurround the third plurality of high-density interconnects 152 ₃. Insome embodiments, the mold material 192 and the first underfill material172 may be the same material. In other embodiments, the mold material192 and the second underfill material 174 may be the same material.

As illustrated in FIG. 10 and according to one embodiment of the presentdescription, a heat dissipation device 200 may be attached to the firstsurface 122 of the substrate 120 of the assembly of FIG. 2, wherein theheat dissipation device 200 defines a fluid chamber 210. In oneembodiment of the present description, the heat dissipation device 200may comprise a main body 202, having a first surface 204 and an opposingsecond surface 206, and a boundary wall 222 extending from the firstsurface 204 of the main body 202 of the heat dissipation device 200. Theboundary wall 222 may be attached or sealed to the first surface 122 ofthe substrate 120 with an attachment adhesive or sealant layer 224. Inanother embodiment, at least a portion of the boundary wall 222 may beattached or sealed to a second surface 114 ₁-114 ₄ of at least one ofthe integrated circuit devices 110 ₁-110 ₄, respectively (illustrated inFIG. 10 as being attached or sealed to the second surface 114 ₂ ofintegrated circuit device 110 ₂). As illustrated in FIG. 10, the heatdissipation device 200 may be a single material throughout, such as whenthe heat dissipation device 200, including the boundary wall 222, isformed by a single process step, including but not limited to stamping,skiving, molding, and the like. In one embodiment, the heat dissipationdevice footing 222 may be a single “picture frame” structuresubstantially surrounding the integrated circuit devices 110 ₁, 110 ₂,110 ₃, 110 ₄.

The attachment adhesive or sealant layer 224 may be any appropriatematerial, including, but not limited to, silicones (such aspolydimethylsiloxane), epoxies, and the like. The heat dissipationdevice 200 may be made of any appropriate thermally conductive material,including, but not limited to at least one metal material and alloys ofmore than one metal. In one embodiment, the heat dissipation device 200may comprise copper, nickel, aluminum, alloys thereof, laminated metalsincluding coated materials (such as nickel coated copper), and the like.

As shown in FIG. 10, the fluid chamber 210 may be substantially definedby the first surface 204 of the main body 202 of the heat dissipationdevice 200, the boundary wall 222 of the heat dissipation device 200,the substrate 120, and the components on the substrate 120 surrounded bythe boundary wall 222 (e.g. integrated circuit devices 110 ₁, 110 ₂, 110₃, 110 ₄, etc.). An inlet conduit 230 may extend from the second surface206 of the main body 202 of the heat dissipation device 200 to the firstsurface 204 of the main body 202 of the heat dissipation device 200. Anoutlet conduit 240 may extend from the first surface 204 of the mainbody 202 of the heat dissipation device 200 to the second surface 206 ofthe main body 202 of the heat dissipation device 200. A heat transferfluid 250 (illustrated generically as a down arrow (left side) and an uparrow (right side)) may flow into the fluid chamber 210 through theinlet conduit 230 and out of the fluid chamber 210 through the outletconduit 240. In one embodiment, the fluid chamber 210 is sealed tocontain the heat transfer fluid 250 and allows for the heat transferfluid 250 to directly contact at least a portion of second surface 114₁-114 ₄ of each of the integrated circuit devices 110 ₁-110 ₄,respectively. The heat transfer fluid 250 may be any appropriate gas orliquid, or a combination thereof. In one embodiment, the heat transferfluid 250 may comprise water. In another embodiment, the heat transferfluid 250 may comprise a dielectric refrigerant. In a furtherembodiment, the heat transfer fluid 250 may comprise an oil. In otherembodiments, the heat transfer fluid 250 may be comprised of two phases(such as liquid water and water vapor, or liquid-phase and gas-phasedielectric refrigerant) that exist simultaneously in one or more regionsof the fluid chamber 210.

It is understood that the heat transfer fluid 250 may not be compatiblewith all of the components within the electronic assembly 160, such asthe first underfill material 172, the second underfill material 174,and/or the substrate 120. For example, the components may be made ofporous material that may lead to the heat transfer fluid 250 migratingthough the porous material and damaging components within the electronicassembly 160. Thus, a coating 260 may be deposited on exposed surfacesof such components. In one embodiment, the coating 260 may cover aportion of the first underfill material 172 and/or a portion of thesecond underfill material 174. In another embodiment, the coating 260may abut the first surface 122 of the substrate 120. In still anotherembodiment, the coating 260 may extend between the first integratedcircuit device 110 ₁ and the second integrated circuit device 110 ₂.

In order to enhance heat transfer from the integrated circuit devices110 ₁-110 ₄, thermally conductive projections 180 may be formed on thesecond surface 114 ₁-114 ₄ of any of the integrated circuit devices 110₁-110 ₄, respectively, to extend into the fluid chamber 210. Thethermally conductive projections 180 may be any appropriate shape,including, but not limited to, fins, pillars, and the like. Thethermally conductive projections 180 may be made from any appropriatethermally conductive material including but not limited to copper,silver, nickel, alloys thereof, and the like. It is understood that thethermally conductive projections 180 may provide additional surface areafor the transfer of heat from integrated circuit devices 110 ₁-110 ₄ bythe heat transfer fluid 250. The fabrication and attachment of suchthermally conductive projections 180 are well known in the art and forthe sake of brevity and conciseness will not be described herein.

Likewise, in order to enhance heat transfer from the heat transfer fluid250 to the heat dissipation device 200, thermally conductive projections252 may be formed on the first surface 204 of the heat dissipationdevice 200, as shown in FIG. 2. The thermally conductive projections 252may be any appropriate shape, including, but not limited to, fins,pillars, and the like. The thermally conductive projections 252 may beformed and attached to the first surface 204 of the heat dissipationdevice 200 or they may be formed as a single material with the heatdissipation device 200, such as when the heat dissipation device 200 isformed by a single process step, including but not limited to stamping,skiving, molding, and the like. It is understood that the thermallyconductive projections 252 may provide additional surface area for thetransfer of heat from the heat transfer fluid 250 to the heatdissipation device 200.

As shown in FIG. 11 (as cross-sectional view along line 11-11 of FIG.10), the thermally conductive projections 252 may be fins arranged in astaggered fashion between the inlet conduit 230 and the outlet conduit240, such that the heat transfer fluid 250 may follow a circuitous routefrom the inlet conduit 230 to the outlet conduit 240, which alsoincreases the residence time of the heat transfer fluid 250 within thefluid chamber 210 (see FIG. 10).

In an embodiment of the present description, the inlet conduit 230 andthe outlet conduit 240 may be arranged as a manifold system in order tointroduce and removed the heat transfer fluid 250 (see FIG. 11) inmultiple locations. As shown in FIG. 12, the inlet conduit 230 maycomprise a main inlet port 232 (illustrated as an arrow) extending fromthe second surface 206 of the main body 202 of the heat dissipationdevice 200 to an inlet channel 234 (illustrated as a line) extendingthrough the main body 202 and a plurality of distribution inlet ports236 (illustrated as arrows) extending from the inlet channel 234 to thefirst surface 204 of the main body 202 of the heat distribution device200. It is understood that the inlet conduit 230 may have any number ofmain inlet ports 232, inlet channels 234, and distribution inlet ports236 in any appropriate configuration. The outlet conduit 240 maycomprise a plurality of distribution outlet ports 246 (illustrated asdashed arrows) extending from the first surface 204 of the main body 202of the heat distribution device 200 to an outlet channel 244(illustrated as a dashed line) extending though the main body 202 of theheat dissipation device 200 and a main outlet port 242 (illustrated as adashed arrow) extending from the outlet channel 244 to the secondsurface 206 of the main body 202 of the heat distribution device 200. Itis understood that the outlet conduit 240 may have any number of mainoutlet ports 242, outlet channels 244, and distribution outlet ports 246in any appropriate configuration.

Although the heat dissipation device 200 illustrated in FIG. 10 showsthe boundary wall 222 as a single material with the main body 202, theembodiments of the present description are not so limited. As shown inFIG. 13, in further embodiments of the present description, the heatdissipation device 200 may consist of at least two parts, wherein a mainportion 202 of the heat dissipation device 200 and the boundary wall 222are separate parts. As shown, the boundary wall 222 may be attached tothe first surface 204 of the main body 202 with an adhesive or sealantlayer 226. Although fabricating the heat dissipation device 200 as amultiple piece assembly will take additional assembly steps, it may makethe fabrication of the heat dissipation device 200 easier, as a whole.The adhesive or sealant layer 226 may be any appropriate material,including, but not limited to silicones (such as polydimethylsiloxane),epoxies, and the like. In one embodiment, the adhesive or sealant layer226 may be the same as the attachment adhesive or sealant layer 224.

In a further embodiment, the underfill material within themicroelectronic package 100 may be utilized to form channels under atleast one of the integrated circuit devices 110 ₁-110 ₄, such that theheat transfer fluid 250 can flow through the channels to remove heatfrom the first surfaces 112 ₁-112 ₄ of any of the integrated circuitdevices 110 ₁-110 ₄, respectively.

As shown in FIG. 14, each of the integrated circuit devices 110 ₁, 110₂, 110 ₃, 110 ₄ may have a separate, patterned underfill materialstructure 190 ₁, 190 ₂, 190 ₃, 190 ₄, respectively, disposed betweenintegrated circuit devices 110 ₁, 110 ₂, 110 ₃, 110 ₄, the substrate120, and/or an integrated circuit device upon which it is stacked. FIG.15 illustrates an exemplary configuration of a first integrated circuitdevice 310 ₁ attached to the first surface 122 of the substrate 120. Asshown, a first surface 312 ₁ of the first integrated circuit device 310₁ may be attached to the first surface 122 of the substrate 120 througha plurality of interconnects 332, such as reflowable solder bumps orballs. The plurality of interconnects 332 may extend from bond pads (notshown) on the first surface 312 ₁ of the first integrated circuit device310 ₁ and bond pads (not shown) on the first surface 122 of thesubstrate 120. As shown, a patterned underfill material 190 may surroundeach of the plurality of interconnects 332 such that at least onechannel 334 is formed between at least two of the interconnects 332. Asfurther shown in FIG. 15, a portion of the first surface 312 ₁ of thefirst integrated circuit device 310 ₁ may be exposed within the at leastone channel 334. The at least one channel 334 will be connected to thefluid chamber 210 (see FIG. 14), such that the heat transfer fluid 250(see FIG. 14) will contact the first surface 312 ₁ of the firstintegrated circuit device 310 ₁ so as to remove heat from the firstintegrated circuit device 310 ₁. A sealant or coating layer 340 may bepatterned within the at least one channel 334 to abut the first surface122 of the substrate 120, when the substrate 120 is incompatible withthe heat transfer fluid 250 (see FIG. 14), as previously discussed.

FIG. 16 illustrates an exemplary configuration of the first integratedcircuit device 310 ₁ attached to a second integrated circuit device 310₂, according to another embodiment of the present description. As shown,a first surface 312 ₁ of the first integrated circuit device 310 ₁ maybe attached to a second surface 314 ₂ of a second integrated circuitdevice 310 ₂ through a plurality of interconnects 332, such asreflowable solder bumps or balls. The plurality of interconnects 332 mayextend from bond pads (not shown) on the first surface 312 ₁ of thefirst integrated circuit device 310 ₁ and bond pads (not shown) on thesecond surface 314 ₂ of the second integrated circuit device 310 ₂. Asshown, the patterned underfill material 190 may surround each of theplurality of interconnects 332 such that at least one channel 334 isformed between at least two of the interconnects 332. As shown in FIG.16, at least a portion of both the first surface 312 ₁ of the firstintegrated circuit device 310 ₁ and the second surface 314 ₂ of thesecond integrated circuit device 310 ₂ may both be exposed within the atleast one channel 334. The at least one channel 334 will be connected tothe fluid chamber 210 (see FIG. 14), such that the heat transfer fluid250 (see FIG. 14) will contact both the first surface 312 ₁ of the firstintegrated circuit device 310 ₁ and the second surface 314 ₂ of thesecond integrated circuit device 310 ₂ so as to remove heat from boththe first integrated circuit device 310 ₁ and the second integratedcircuit device 310 ₂.

FIG. 17 illustrates an embodiment of the configuration of channels 334,along line 17-17 of FIG. 16. As shown, the interconnects 332 may bealigned in rows 350 ₁-350 ₃, (shown as dashed lines), wherein each ofthe rows 350 ₁-350 ₃ of interconnects 332 are encapsulated in theunderfill material 190 to form a plurality of channel walls 360 ₁-360 ₃,wherein a plurality of channels 334 are defined between the channelwalls 360 ₁-360 ₃. In one embodiment, the plurality of channels 334 maybe substantially parallel to the flow of the heat transfer fluid(illustrated by arrows 250), e.g. in the general direction of the inletconduit 230 to the outlet conduit 240 (shown in FIG. 14).

The structure of FIG. 17 may be formed by patterning the underfillmaterial 190 on the second integrated circuit device 310 ₂ (see FIG. 16)and attaching the interconnects 332 to the first integrated circuitdevice 310 ₁ (see FIG. 16) prior to attaching the first integratedcircuit device 310 ₁ to the second integrated circuit device 310 ₂.During attachment, the interconnects 332 may be pressed through theunderfill material 190 and, when the interconnects 332 are made ofsolder, the solder may be reflowed, either by heat, pressure, and/orsonic energy to secure the solder and make an electrical connectionbetween the first integrated circuit device 310 ₁ (see FIG. 16) and thesecond integrated circuit device 310 ₂ (see FIG. 16). The specificprocesses and materials used in the fabrication of the patternedunderfill material 190 are known in the art and for the purposes ofbrevity and conciseness will not be described therein.

FIG. 18 illustrates one embodiment of the configuration of a singlechannel 334. As shown, each individual interconnect 332 may beencapsulated in the underfill material 190, wherein the single channel334 is defined by two opposing side walls 342 ₁ and 342 ₂, and whereinthe interconnects 332 are disposed between the opposing side walls 342 ₁and 342 ₂. In one embodiment, the opposing side walls 342 ₁ and 342 ₂may be substantially parallel to the flow of the heat transfer fluid(illustrated by arrows 250), e.g. in the general direction of the inletconduit 230 to the outlet conduit 240 (shown in FIG. 14).

As with the structure shown in FIG. 17, the structure shown in FIG. 18may be formed by patterning the underfill material 190 on the secondintegrated circuit device 310 ₂ (see FIG. 16) and attaching theinterconnects 332 to the first integrated circuit device 310 ₁ (see FIG.16) prior to attaching the first integrated circuit device 310 ₁ to thesecond integrated circuit device 310 ₁. During attachment, theinterconnects 332 may be pressed through the underfill material 190 and,when the interconnects 332 are made of solder, the solder may bereflowed, either by heat, pressure, and/or sonic energy to secure thesolder and make an electrical connection between the first integratedcircuit device 310 ₁ (see FIG. 16) and the second integrated circuitdevice 310 ₂ (see FIG. 16). The specific processes and materials used inthe fabrication of the patterned underfill material 190 are known in theart and for the purposes of brevity and conciseness will not bedescribed therein.

It is, of course, understood that the embodiments illustrated in FIGS.17 and 18 are merely exemplary and the channel(s) 334 may have anyappropriate configuration.

FIGS. 19-24 illustrate further embodiments of the configuration of thechannel 334, wherein the interconnects 332 are grouped and surrounded bya sealing structure. FIG. 19 illustrates an exemplary configuration ofthe first integrated circuit device 310 ₁ attached to the first surface122 of the substrate 120. As shown, the first surface 312 ₁ of the firstintegrated circuit device 310 ₁ may be attached to the first surface 122of the substrate 120 through at least one interconnect grouping orisland 352. The at least one interconnect grouping or island 352 maycomprises a plurality of interconnects 332 surrounded by a sealingstructure 354. The plurality of interconnects 332 may extend from bondpads (not shown) on the first surface 312 ₁ of the first integratedcircuit device 310 ₁ and bond pads (not shown) on the first surface 122of the substrate 120. The sealing structure 354 may extend between thefirst surface 312 ₁ of the first integrated circuit device 310 ₁ and thefirst surface 122 of the substrate 120. In one embodiment, the sealingstructures 354 may be electrically conductive and may form an electricalconnection between the first integrated circuit device 310 ₁ and thesubstrate 120. In a further embodiment, the material used to form theinterconnects 332 may be the same as the material used to form thesealing structures 354, such as a solder material. In one embodiment, anunderfill material 356 may be disposed within the grouping between theplurality of interconnects 332 and the sealing structure 354.

As further shown in FIG. 19, a portion of the first surface 312 ₁ of thefirst integrated circuit device 310 ₁ may be exposed within the at leastone channel 334. The at least one channel 334 will be connected to thefluid chamber 210 (see FIG. 14), such that the heat transfer fluid 250(see FIG. 14) will contact the first surface 312 ₁ of the firstintegrated circuit device 310 ₁, so as to remove heat from the firstintegrated circuit device 310 ₁. A sealant or coating layer 340 may bepatterned within the at least one channel 334 to abut the first surface122 of the substrate 120, when the substrate 120 is incompatible withthe heat transfer fluid 250.

FIG. 20 illustrates an exemplary configuration of a first integratedcircuit device 310 ₁ attached to a second integrated circuit device 310₂, according to another embodiment of the present description. As shown,a first surface 312 ₁ of the first integrated circuit device 310 ₁ maybe attached to a second surface 314 ₂ of a second integrated circuitdevice 310 ₂ through at least one interconnect grouping or island 352.As with the embodiment of FIG. 19, the at least one interconnectgrouping or island 352 may comprises a plurality of interconnects 332surrounded by the sealing structure 354. The plurality of interconnects332 may extend from bond pads (not shown) on the first surface 312 ₁ ofthe first integrated circuit device 310 ₁ and bond pads (not shown) onthe second surface 314 ₂ of the second integrated circuit device 310 ₂.The sealing structure 354 may extend between the first surface 312 ₁ ofthe first integrated circuit device 310 ₁ and the second surface 314 ₂of the second integrated circuit device 310 ₂. In one embodiment, thesealing structures 354 may be electrically conductive and may form anelectrical connection between the first integrated circuit device 310 ₁and the second integrated circuit device 310 ₂. In a further embodiment,the material used to form the interconnects 332 may be the same as thematerial used to form the sealing structures 354, such as a soldermaterial. In one embodiment, the underfill material 356 may be disposedwithin the grouping between the plurality of interconnects 332 and thesealing structure 354.

As shown, the interconnect groupings 352 may be arranged such that atleast one channel 334 is formed. As shown in FIG. 20, at least a portionof both the first surface 312 ₁ of the first integrated circuit device310 ₁ and the second surface 314 ₂ of the second integrated circuitdevice 310 ₂ may both be exposed within the at least one channel 334.The at least one channel 334 will be connected to the fluid chamber 210(see FIG. 14), such that the heat transfer fluid 250 (see FIG. 14) willcontact both the first surface 312 ₁ of the first integrated circuitdevice 310 ₁ and the second surface 314 ₂ of the second integratedcircuit device 310 ₂ so as to remove heat from both the first integratedcircuit device 310 ₁ and the second integrated circuit device 310 ₂.

FIG. 21 illustrates one embodiment of the configuration of a channel 334along line 21-21 of FIG. 20, wherein the channel 334 is defined by twoopposing side walls 342 ₁ and 342 ₂ and the interconnects 332 aredisposed between the opposing side walls 342 ₁ and 342 ₂. In oneembodiment, the opposing side walls 342 ₁ and 342 ₂ may extendsubstantially parallel to the flow of the heat transfer fluid(illustrated by arrows 250), e.g. in the general direction of the inletconduit 230 to the outlet conduit 240 (shown in FIG. 14). In oneembodiment, the two opposing side walls 342 ₁ and 342 ₂ may be formedfrom the same material as is used to form the sealing structure 354. Ina further embodiment, at least one of the side walls 342 ₁ and 342 ₂ maybe conjoined with one of the sealing structures 354 of at least oneinterconnect grouping 352. The specific processes and materials used inthe fabrication of the groupings 352 and side walls 342 ₁ and 342 ₂ areknown in the art and for the purposes of brevity and conciseness willnot be described therein.

Although FIG. 21 illustrates the groupings 352 as substantially squarewith four interconnects 332 per interconnect grouping 352, it isunderstood that the interconnect grouping 352 may have any appropriateconfiguration for the interconnects 332. For example, as shown in FIG.22, the interconnect groupings 352 may be at least one elongatedrectangular structure. The interconnect groupings 352 may besubstantially diamond shaped or portions thereof, as shown in FIG. 23.As shown in FIG. 24, a combination of different shaped interconnectgroupings may be used, such as diamond shaped interconnect groupings 352d and circular interconnect groupings 352 c. It is understood that thepositions and shapes of the interconnect groupings 352, 352 c, 352 d maybe determined based on the position(s) of hotspots and/or desiredcooling profiles.

FIG. 25 illustrates an electronic or computing device 400 in accordancewith one implementation of the present description. The computing device400 may include a housing 401 having a board 402 disposed therein. Theboard 402 may include a number of integrated circuit components,including but not limited to a processor 404, at least one communicationchip 406A, 406B, volatile memory 408 (e.g., DRAM), non-volatile memory410 (e.g., ROM), flash memory 412, a graphics processor or CPU 414, adigital signal processor (not shown), a crypto processor (not shown), achipset 416, an antenna, a display (touchscreen display), a touchscreencontroller, a battery, an audio codec (not shown), a video codec (notshown), a power amplifier (AMP), a global positioning system (GPS)device, a compass, an accelerometer (not shown), a gyroscope (notshown), a speaker, a camera, and a mass storage device (not shown) (suchas hard disk drive, compact disk (CD), digital versatile disk (DVD), andso forth). Any of the integrated circuit components may be physicallyand electrically coupled to the board 402. In some implementations, atleast one of the integrated circuit components may be a part of theprocessor 404.

The communication chip enables wireless communications for the transferof data to and from the computing device. The term “wireless” and itsderivatives may be used to describe circuits, devices, systems, methods,techniques, communications channels, etc., that may communicate datathrough the use of modulated electromagnetic radiation through anon-solid medium. The term does not imply that the associated devices donot contain any wires, although in some embodiments they might not. Thecommunication chip may implement any of a number of wireless standardsor protocols, including but not limited to Wi-Fi (IEEE 802.11 family),WiMAX (IEEE 802.16 family), IEEE 802.20, long term evolution (LTE),Ev-DO, HSPA+, HSDPA+, HSUPA+, EDGE, GSM, GPRS, CDMA, TDMA, DECT,Bluetooth, derivatives thereof, as well as any other wireless protocolsthat are designated as 3G, 4G, 5G, and beyond. The computing device mayinclude a plurality of communication chips. For instance, a firstcommunication chip may be dedicated to shorter range wirelesscommunications such as Wi-Fi and Bluetooth and a second communicationchip may be dedicated to longer range wireless communications such asGPS, EDGE, GPRS, CDMA, WiMAX, LTE, Ev-DO, and others.

The term “processor” may refer to any device or portion of a device thatprocesses electronic data from registers and/or memory to transform thatelectronic data into other electronic data that may be stored inregisters and/or memory.

At least one of the integrated circuit components may include anintegrated circuit assembly comprising a substrate, a first integratedcircuit device electrically attached to the substrate, a secondintegrated circuit device electrically attached to the first integratedcircuit device, and a heat dissipation device defining a fluid chamber,wherein at least a portion of the first integrated circuit device and atleast a portion of the second integrated circuit device are exposed tothe fluid chamber. The integrated circuit assembly may further includeat least one channel formed in an underfill material between the firstintegrated circuit device and the second integrated circuit device,between the first integrated circuit device and the substrate, and/orbetween the second integrated circuit device and the substrate, whereinthe at least one channel is open to the fluid chamber.

In various implementations, the computing device may be a laptop, anetbook, a notebook, an ultrabook, a smartphone, a tablet, a personaldigital assistant (PDA), an ultra-mobile PC, a mobile phone, a desktopcomputer, a server, a printer, a scanner, a monitor, a set-top box, anentertainment control unit, a digital camera, a portable music player,or a digital video recorder. In further implementations, the computingdevice may be any other electronic device that processes data.

It is understood that the subject matter of the present description isnot necessarily limited to specific applications illustrated in FIGS.1-25. The subject matter may be applied to other integrated circuitdevices and assembly applications, as well as any appropriate electronicapplication, as will be understood to those skilled in the art.

Having thus described in detail embodiments of the present invention, itis understood that the invention defined by the appended claims is notto be limited by particular details set forth in the above description,as many apparent variations thereof are possible without departing fromthe spirit or scope thereof.

What is claimed is:
 1. An integrated circuit assembly, comprising: asubstrate; a first integrated circuit device having a first surface andan opposing second surface, wherein the first integrated circuit deviceis electrically attached to the substrate with a first plurality ofdevice-to-substrate interconnects extending between the first surface ofthe first integrated circuit device and the substrate; a secondintegrated circuit device having a first surface and an opposing secondsurface, wherein the first surface of the second integrated circuitdevice is electrically attached to the second surface of the firstintegrated circuit device with a plurality of device-to-deviceinterconnects; an underfill material surrounding each of the pluralityof device-to-device interconnects; a heat dissipation device defining afluid chamber, wherein at least a portion of the second surface of thefirst integrated circuit device is exposed to the fluid chamber andwherein at least a portion of the second surface of the secondintegrated circuit device is exposed to the fluid chamber; and at leastone channel formed within the underfill material, wherein the at leastone channel is open to the fluid chamber and wherein at least a portionof the first surface of the second integrated circuit device is exposedwithin the at least one channel.
 2. The integrated circuit assembly ofclaim 1, wherein the substrate further includes a recess and wherein atleast a portion of the first integrated circuit device resides withinthe recess.
 3. The integrated circuit assembly of claim 1, wherein thefirst surface of the second integrated circuit device is electricallyattached to the substrate with a second plurality of device-to-substrateinterconnects extending between the first surface of the secondintegrated circuit device and the substrate.
 4. The integrated circuitassembly of claim 1, further including at least one heat dissipationprojection extending into the fluid chamber from at least one of thesecond surface of the first integrated circuit device and the secondsurface of the second integrated circuit device.
 5. The integratedcircuit assembly of claim 1, wherein the heat dissipation devicecomprises a main body, having a first surface and an opposing secondsurface, and a boundary wall extending from the first surface of themain body.
 6. The integrated circuit assembly of claim 5, wherein atleast a portion of the boundary wall of the heat dissipation device issealed to the substrate.
 7. The integrated circuit assembly of claim 5,wherein the heat dissipation device includes an input conduit extendingfrom the second surface of the main body to the first surface of themain body, and an output port extending from the first surface of themain body to the second surface of the main body.
 8. The integratedcircuit assembly of claim 5, wherein the heat dissipation devicecomprises a plurality of heat dissipation projections extending from thefirst surface of the main body of the heat dissipation device.
 9. Theintegrated circuit assembly of claim 1, further comprising a heattransfer fluid disposed in the heat dissipation device defining a fluidchamber of the heat dissipation device.
 10. An integrated circuitassembly, comprising: a substrate; a first integrated circuit devicehaving a first surface and an opposing second surface, wherein the firstintegrated circuit device is electrically attached to the substrate witha first plurality of device-to-substrate interconnects extending betweenthe first surface of the first integrated circuit device and thesubstrate; a second integrated circuit device having a first surface andan opposing second surface, wherein the first surface of the secondintegrated circuit device is electrically attached to the second surfaceof the first integrated circuit device with a plurality ofdevice-to-device interconnects, and wherein the first surface of thesecond integrated circuit device is electrically attached to thesubstrate with a second plurality of device-to-substrate interconnectsextending between the first surface of the second integrated circuitdevice and the substrate; an underfill material surrounding each of thesecond plurality of device-to-substrate interconnects; a heatdissipation device defining a fluid chamber, wherein at least a portionof the second surface of the first integrated circuit device is exposedto the fluid chamber and wherein at least a portion of the secondsurface of the second integrated circuit device is exposed to the fluidchamber; and at least one channel formed within the underfill material,wherein the at least one channel is open to the fluid chamber andwherein at least a portion of the first surface of the second integratedcircuit device is exposed within the at least one channel.
 11. Theintegrated circuit assembly of claim 10, wherein the substrate furtherincludes a recess and wherein at least a portion of the first integratedcircuit device resides within the recess.
 12. The integrated circuitassembly of claim 10, further including at least one heat dissipationprojection extending into the fluid chamber from at least one of thesecond surface of the first integrated circuit device and the secondsurface of the second integrated circuit device.
 13. The integratedcircuit assembly of claim 10, wherein the heat dissipation devicecomprises a main body, having a first surface and an opposing secondsurface, and a boundary wall extending from the first surface of themain body.
 14. The integrated circuit assembly of claim 13, wherein atleast a portion of the boundary wall of the heat dissipation device issealed to the substrate.
 15. The integrated circuit assembly of claim13, wherein the heat dissipation device includes an input conduitextending from the second surface of the main body to the first surfaceof the main body, and an output port extending from the first surface ofthe main body to the second surface of the main body.
 16. The integratedcircuit assembly of claim 13, wherein the heat dissipation devicecomprises a plurality of heat dissipation projections extending from thefirst surface of the main body of the heat dissipation device.
 17. Theintegrated circuit assembly of claim 10, further comprising a heattransfer fluid disposed in the heat dissipation device defining a fluidchamber of the heat dissipation device.